Why the snap_id is not generated sequentially in statspack?

I submitted some snaps manually, and thru dbms_job, the snap_ids are not sequential:
SQL> select SNAP_ID,to_char(SNAP_TIME,'DD-MON-YY HH24:MI') timestamp from stats$snapshot order by 1;
SNAP_ID TIMESTAMP
1 22-AUG-06 08:19
2 22-AUG-06 08:19
3 22-AUG-06 08:26
4 22-AUG-06 08:26
11 22-AUG-06 10:32
22 22-AUG-06 12:26
31 23-AUG-06 07:53
32 23-AUG-06 08:29
41 23-AUG-06 19:00
42 23-AUG-06 23:00
51 24-AUG-06 03:00
52 24-AUG-06 07:00
Could someone explain? Thanks.
- Zack

It probably generates the snap_id using a sequence with a cache value of 10. When the shared pool is flushed or the db is shutdown the cached values will be lost.

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Why the snap_id is not generated sequentially in statspack?

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